AVR-Chat

On the particular board I am designing there are probably a dozen places
where using 0402 would be beneficial, and in these cases, I don't need to
run traces underneath them. In general, I use 0805 or above, but for this
particular board the extra density would be nice.

On Thu, May 26, 2011 at 3:54 AM, ecros_technology
<Yahoo37849@ecrostech.com>wrote:

> --- In AVR-Chat@yahoogroups.com, Mike Payson <mike@...> wrote:
>
> > ... interested in EzPCB ... offer to populate 0402
> > resistors and capacitors for free ... asked support representative ...
> transcript of the live chat:
>
> Thank you very much for going to this trouble and posting the results of
> your investigation.
>
> I don't want to warp this thread off its topic, but if I correctly read
> between the lines that you don't like populating 0402 components, I have to
> agree with you.  Everything down to 0603 is fine, but with 0402 I have
> trouble getting the right amount of solder paste without a stencil (i.e. for
> prototypes).  As a result, about 10% of the parts "tombstone" (stand up on
> end) and I have to laboriously reposition them after reflow.
>
> I have decided not to use 0402 parts.  Unless I omit the silkscreen marking
> of the ref. des., they don't really save that much space.  Also, I can get a
> trace under an 0603 part, which helps routing and can save vias so, again,
> I'm not convinced that an 0402 saves space.  If the customer requires 0402,
> of course, them I'm OK with that.
>
> We should also be clear that the EzPCB offer applies only to "parts in
> stock".  It's not at all clear how to find out what that means.
>
> Graham.
>
>
>
>
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